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The "Not Sign (¬)" Symbol in Mathematics
55 Synonyms & Antonyms for NOT A SIGN OF - Thesaurus.com
¬ | Not Symbol (Meaning, How To Type on Keyboard, & More)
List of logic symbols - Wikipedia
What is the origin of != in the meaning "not equal to"?
there is no sign of somebody/something | meaning of there is no sign …
negation - Should it be "no sign of" or "no signs of"? - English ...
Matthew 12:39: Why "there shall no sign, but the sign of the …
Definition of 'no sign of someone' - Collins Online Dictionary
'Not-Sign' | Symbol and Codes - Cyber Definitions